Foldable chair
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Solution Overview
Problem
Conventional foldable chairs face difficulties in conveniently storing and folding their backrest structures, which complicates the storage process and affects user experience.
Innovation Solution
A chair frame design featuring oppositely arranged backrest tubes with crosswise connected cross tubes, a lock catch, and backrest supporting tubes, allowing for easy unfolding and folding by controlling the lock catch, simplifying the operation and enhancing usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backrest structure uses a conventional folding mechanism, then the chair can be folded, but the storage and folding process becomes inconvenient and complex
Solution Approach 1:
The backrest structure is divided into multiple independent tubes (first backrest tube, second backrest tube, cross tubes, supporting tubes) that can fold independently. Each tube segment is connected through rotatable joints, allowing the backrest to be segmented into collapsible sections that simplify the folding process and improve storage convenience.
Solution Approach 2:
The patent employs rotatable connections between tubes instead of fixed joints, enabling dynamic adjustment and folding of the backrest structure. The rotatable connections allow the backrest to transition between extended and folded states smoothly, making the folding operation more convenient while maintaining structural integrity.
2Stability of the object's composition
If the backrest structure is made rigid for stability, then the chair is stable, but the folding and storage process becomes difficult
Solution Approach 1:
The backrest structure uses rotatable connections that provide dynamic stability - the structure remains stable in its extended position during use, but can be easily folded when needed. The rotatable joints maintain structural integrity while enabling convenient folding operations.
Solution Approach 2:
By segmenting the backrest into multiple connected tubes with rotatable joints, the structure achieves stability when extended while allowing easy folding. Each segment contributes to overall stability during use, but can be independently adjusted or folded for storage.
Data Source
AI summary
A chair has a foldable chair that is movable between a folded and expanded configuration. The frame includes two backrest tubes arranged on opposite sides of the frame. Two cross tubes are arranged crosswise between the two backrest tubes. The two cross tubes are rotatably connected to each other. The top of each cross tube is rotatably connected to the corresponding backrest tube. Two backrest supporting tubes extend from a lock catch to a corresponding cross tube. Each back rest supporting tube is rotatably connected to the lock catch, and the other ends of the two backrest supporting tubes are respectively rotatably connected to different cross tubes. The bottom of each cross tube is rotatably connected to an end of a corresponding backrest transverse supporting tube. An opposite end of the backrest transverse supporting tube is rotatably connected to a backrest tube.